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Link to relevant study record(s)

Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25-26 June 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The study was conducted according to an internationally recognised method, and under GLP. The substance is considered to be adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
UN Manual of Tests and Criteria: Part I: Classification procedures, test methods and criteria relating to explosives of Class 1
Version / remarks:
“Recommendations on the Transport of Dangerous Goods; Manual of Tests and Criteria”; sixth revised edition, UN, 2015, Section 20.2.1, 20.3.3.3 and Apendix 6 / Screening test
Qualifier:
according to
Guideline:
other: OECD Guidelines for the Testing of Chemicals, Method No. 113, adopted 12. May 1981: “Screening Test for Thermal Stability and Stability in Air”
Version / remarks:
1981
GLP compliance:
yes (incl. certificate)
Remarks:
Date of inspection: 15-16 November 2017; Date of signature: 15 May 2018
Key result
Parameter:
other: DSC screening test
Remarks on result:
negative (not further specified)
Remarks:
no significant exothermic event was observed during the DSC run

Calibration :

The measurement of indium after calibration met the validity criteria.

 

Safety pre-test 1

Heating on a magnesia groove:

When heated on a magnesia groove over a Bunsen burner, the test item was liquified to a brown liquid which burned with yellow sooting flame.

Beaten with a hammer:

When the test item was beaten with a hammer on the anvil, no reaction was observed.

Safety pre-test 2

After reaching a temperature of 520 °C and cooling down the weight of the crucible with the test item was recorded with 622.31 mg, the outside gold sealing of the crucible was grey and bulged outwards.

Then the crucible was opened, the inside of the crucible was black and smelled like motor oil. The deformation of the inside gold sealing was visible.

 

Results of DSC measurement:

No exothermic event was detected till 520°C. Only a sharp increase of the baseline (endothermic event) was observed at 485.53°C.

Table 4.14.1

   Observations

Mass test item

Mass crucible (before measurement):

Mass crucible (after measurement):

Observations

2.86 mg

624.05 mg

621.85 mg

After the test the crucible slightly bloated. The crucible was opened, all observations was the same as in safety pre-test 2.

Interpretation of results:
GHS criteria not met
Conclusions:
A screening test via DSC (differential scanning calorimetry) was conducted from 0°C to 520 °C.
During the DSC run no exothermic event was observed till 520°C. Only a sharp increase of the baseline (endothermic event) was observed at 485.53°C.
Executive summary:

The thermal stability of the test substance was tested with Differential Scanning Calorimetry, in accordance with conditions recommended in UN MTC screening procedure/OECD guideline. Up to the maximum test temperature of 520°C, no exothermal event was observed.

Only a sharp increase of the baseline (endothermic event) was observed at 485.53°C

According to the “Recommendations on the Transport of Dangerous Goods; Manual of Tests and Criteria” (TDG/MTC, 2015) and as no significant released energy was detected, it is stated:

-       the released energy is less than 500 J/g, the acceptance procedures for Class 1 explosives need not to be applied (TDG/MTC, 6th edition, 2015, Appendix VI §3.3.c)

Description of key information

DSC screening test: No exothermal event was observed up to 520°C. Only a sharp increase of the baseline (endothermic event) was observed at 485.53°C.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

A fully reliable experimental study, conducted in accordance with conditions recommended in UN MTC screening procedures/OECD guideline, and under GLP, is available. It is considered as a key study. The result is retained as key data.

No further testing is required.

Justification for classification or non-classification

During the DSC run (from 0 to 520 °C) no exothermal event was observed up to 520°C. Only a sharp increase of the baseline (endothermic event) was observed at 485.53°C.

Therefore, the acceptance procedures for Class 1 explosives need not to be applied.

No additional testing is required. The substance shall not be classified as explosive according to Regulation (EC) N°1272/2008 (CLP).